We went in August and we just walked up and purchased tickets. Thats what everyone was doing.
Generally you can show up at the pickup location and be able to get on during busier tourism times you may have to wait for the next trolley.
We needed reservations for the weekend but we had 4 people. They were took 2 people without reservations.
During the week probably not except during the months that cruises are stopping in one of the ports.
No
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